milling heads and what size valves???
Thread Starter
TECH Veteran
iTrader: (6)
Joined: Feb 2002
Posts: 4,766
Likes: 0
From: Phoenix, AZ USA
milling heads and what size valves??? Stock short block......5.7 Liter heads....
I am haveing a local engine builder port/polish and mill my heads. What is the most anyone has milled 5.7 heads with a TR 224/224 cam? What about with a TR 230/224 cam?
What size valve should I use?
options are as follows:
intake - 2.000, 2.020, 2.055, or 2.080
exhaust - 1.550, 1.575, 1.600
Some people say don't go any bigger than the 2.020/1.575 combo for street while the guy doing the work said "stuff the biggest thing you can fit."
What do I do? The car is for daily street driving and road racing (don't care about 1/4 mile).
I am haveing a local engine builder port/polish and mill my heads. What is the most anyone has milled 5.7 heads with a TR 224/224 cam? What about with a TR 230/224 cam?
What size valve should I use?
options are as follows:
intake - 2.000, 2.020, 2.055, or 2.080
exhaust - 1.550, 1.575, 1.600
Some people say don't go any bigger than the 2.020/1.575 combo for street while the guy doing the work said "stuff the biggest thing you can fit."
What do I do? The car is for daily street driving and road racing (don't care about 1/4 mile).
Re: milling heads and what size valves??? We put in 2.02/1.55 valves, and a 2.02/1.57 would be the biggest valve I would put in a stock shortblock. We just had a customer pull off heads with 2.08 valves and install our Stage I heads that are fully CNC ported but only have stock valves. With a big cam he made around 420 RWHP which is more then the big valve heads made and the small valve heads had much better idle and drivabilty. Don't go too big on the valves. As far as milling, I'm not sure but I think .030"-.040" for the TR224 and about .010" for the TR230/224.
Brian @ TEA
Brian @ TEA
TECH Fanatic
Joined: Nov 2001
Posts: 1,975
Likes: 2
From: SW Florida
Re: milling heads and what size valves??? Correct me if i'm wrong, but I believe the 2.02"/1.57" valves are the largest you can actually install in a 5.7 LS1 head and still use the stock valve seats.
Like Brian said, you don't need anything bigger than that in your stock displacement daily driver.
Like Brian said, you don't need anything bigger than that in your stock displacement daily driver.
TECH Addict
Joined: Dec 2001
Posts: 2,340
Likes: 0
From: Fort Worth,TX
Re: milling heads and what size valves??? </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Kimchee and Rice:
<strong>Correct me if i'm wrong, but I believe the 2.02"/1.57" valves are the largest you can actually install in a 5.7 LS1 head and still use the stock valve seats.
Like Brian said, you don't need anything bigger than that in your stock displacement daily driver.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Ditto and not trying to be rude but if he is talking that way to you then I would find someone else to do the work because he is not experienced with ls1 heads.Bigger will hurt on stock displacement.If he believes bigger is better then he may hog out the heads.
<strong>Correct me if i'm wrong, but I believe the 2.02"/1.57" valves are the largest you can actually install in a 5.7 LS1 head and still use the stock valve seats.
Like Brian said, you don't need anything bigger than that in your stock displacement daily driver.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Ditto and not trying to be rude but if he is talking that way to you then I would find someone else to do the work because he is not experienced with ls1 heads.Bigger will hurt on stock displacement.If he believes bigger is better then he may hog out the heads.
Re: milling heads and what size valves??? </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">"stuff the biggest thing you can fit." </font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Yep, good advice. I have MMS Stage IIIx 5.3L heads milled 0.040" with 2.10" intake and 1.60" exhaust valves with a 236/236//591/591//112 cam. No problems at all.
You should have no problems milling your heads 0.040 along with the TR cam you have. If you stay with stock seats, the biggest valves you can go with are 2.02" intake and 1.57" exhaust.
You should have no problems milling your heads 0.040 along with the TR cam you have. If you stay with stock seats, the biggest valves you can go with are 2.02" intake and 1.57" exhaust.
Thread Starter
TECH Veteran
iTrader: (6)
Joined: Feb 2002
Posts: 4,766
Likes: 0
From: Phoenix, AZ USA
Re: milling heads and what size valves??? ls1290 ...... is that on the stock cubes? Thats actually what they guy told me he could get it 2.1" and 1.6". Did it change the way your car works at low RPM at all?
